Pump



Aug. '7, 1923. 4.1464223 c. A. sLEucHER PUMP Filed March 10 1917 hwenm@hordes A Secher Anya,

Patented fling; il", lltlfdth Cin TROY, NEW' Yltlil, il.

lPUllTP.

Application 'filed March l0, li3l7 Serial No.

To @ZZ Lc/10m t may concer-n.'

Be it known that l, Ci-rennns fi. SLEICHER, a. citizen of the UnitedStates, residing at Troy, county et Aensselaer, State of New York, haveinvented an linprovenient in Pumps, olE which the following description,in connection with the accompanying drawing, n specitcation, likecharacters on the drawing representing like parts.

This intention relates Ato pumps and par-- ticularly to air pumpsadapted ior pumpingl up automobile tires. impe which are used forpumping up automobile tires are :frequently required to developpressures ci Yfrom seventy to one hundred und titty pounds, and this, etcourse, necessitates pistons ivnich tightly lit the cylinders. ln orderthat such pumps may be used successfully, it is importent that thepiston should be kept lubricated lt is also important that theconstruction should be such es to pre vent any oil i'roin Working by thepiston into the compression end ot the cylinder because the presence oicoil in the air which is forced into a. pneumatic tire will have edeleterious effect upon the rubber of the tire.

'lhe object oit my invention is to provide e, novel pump 'which is soconstructed as to provide the necessary tight joint between the pistonand cylinder and which is also constructed so as tc provide thenecessary lubrication ot the piston Without permitting any oil fromWorking past the piston into the compression end of the cylinder.

ln order to give an understanding of my invention, l have illustrated inthe drawings a selected embodiment thereof which Will now be described,aiter which the novel features will be pointedout in the appendedcla-im.

ln the drawings, lll l is a vertical sectional view through a pumpembodying my invention Fig. 2 is :i section on the line 2-2, l.

The pump herein shown comprises the cylinder l having an inlet port 9and also provided in its head or end with an outlet port 2 controlled bya spring-pressed check vulve 3. @pointing` in the cylinder is the piston-1 Which. is connected to e, driving shaft 5 by e suitable connectingrod 6. rlhe connecting' rod is shown as connected to an. eccentric 7carried by the driving shaft 5.

ln order to make e tight joint between the piston and cylinder, employthe usual piston rings 8.

The pump is also provided with closed crank casing l0 which is adaptedto contain oil so that as the pump is operated the eccentric endeccentric strap will dip into the oil and thus throw the oil Iagainstthe underside of the piston and the exposed portions opt the Walls oi"the cylinder. This Will keep the parts properly lubricated.

ln Order to prevent the oil from Working by the piston, l provide anannuler groove il in the lower end of the piston and then i place inseid groove a pecking-ring 12 of relt, vwhich packing ring engages theWalls of the cylinder. l will also preferably piece a split ring' 13 inthe bottoin of the groove il und inside ot the telt packing ring l2, thesplit ring being,` in the nature olil a prinlfgring which tends to torcethe telt packing,` outwardly into contact with the walls of thecylinder. rlhe telt packing ring' 12s has absorbent qualities and thespring,` ringr 13 is constructed to hold the packing` ring' l2 againstthe Walls of the cylinder With suihcient pressure to prevent any excessoil Working' by the packing i2. rl"his pressure, however, is notsufficient to eliminate entirely the absorptive properties of thepacking` ring l2 so that the latter will absorb a certain amount of oil.The pressure ci the packing ring aga-inst the cylinder is suiiicient sothat during the down stroke oi? the piston said ring will scrape excessoil iroin the cylinder Walls and the absorbent quality of the packing,rring Vwill assist this operation so that no excess oil can Work by thepiston.

l claim:

ln an air pump, the combination with e crank casing containing oil, oi asingle# acting cylinder mounted on and having,- one end communicatingwith the crank case, a piston in the cylinder, a crank shaft journalledin the crunk case and connected to the piston, said piston being`provided near its Working end with a plurality ot piston rings to make etight joint with the cylvinder Wells and to prevent the materiel beingpumped 'from leaking past the piston durino the coronressin stroke saidiston also having means to prevent excess oil.

from Working past the piston during the suction stroke and a compressingannular peripheral groove in said piston Iadjacent its end which facesthe crank ease, a ring of felt or absorbent material situated in saidgroove and a split resilient ring in the bottom of the groove behindsaid felt ring and tending to expand the felt ring outwardly intoContact With the Walls of the Cylinder with suicient pressure to preventexcess oil from Working past the piston. l0

In testimony vvhereof7 I have signed my name to this specification.

CHARLES A. sLEIoHER.

